CN205779317U - A kind of marine low speed diesel engine Venturi tube ERG of improvement - Google Patents
A kind of marine low speed diesel engine Venturi tube ERG of improvement Download PDFInfo
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- CN205779317U CN205779317U CN201620407269.6U CN201620407269U CN205779317U CN 205779317 U CN205779317 U CN 205779317U CN 201620407269 U CN201620407269 U CN 201620407269U CN 205779317 U CN205779317 U CN 205779317U
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- venturi tube
- diesel engine
- egr
- exhaust
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Abstract
The purpose of this utility model is to provide the marine low speed diesel engine Venturi tube ERG of a kind of improvement, including diesel engine, turbocharger, Venturi tube, turbocharger includes turbine and compressor, described diesel engine connects inlet manifold and exhaust main respectively, exhaust main is respectively communicated with turbine inlet pipeline and EGR line, compressor connection blower outlet pipeline, EGR line is by the exhaust gas entrance of exhaust inlet pipe connection Venturi tube, the import of blower outlet pipeline connection Venturi tube, inlet manifold connects the outlet of Venturi tube, cooler for recycled exhaust gas and EGR valve are installed on EGR line, charge air cooler is installed on blower outlet pipeline.This utility model solves original high pressure EGR system EGR gas can not enter air inlet pipe, there is the problem that waste gas flows backwards, can realize preferable EGR rate under full working scope；And solve the problem that EGR gas produces bigger pressure oscillation to air inlet.
Description
Technical field
The utility model relates to a kind of diesel engine exhaust gas treatment device, specifically diesel exhaust recirculation dress
Put.
Background technology
Large-sized low-speed boat diesel engine is owing to reliability is high, burning poor quality fuel oil, and maintenance cycle can arrive several ten thousand hours, the longevity
Life and maintenance are good compared to middle high speed diesel engine, have been used as Ship Propeling main frame.Along with a large amount of uses of marine diesel, its
Exhaust emission is the most serious to the harm of marine atmosphere and harbour environment.Nitrogen oxides (NOX) is two-stroke diesel engines
One of primary discharge pollutant.According to statistics, nitrogen oxides (NOX) discharge capacity is about 12,750,000 tons/year, and whole world marine vessel is every
The NOx amount that year discharges accounts for the 18%～30% of the whole world total DS NOx Est amount.
Along with the progressively enforcement of IMO Tier III standard, the requirement of NOx emission limit value is increasingly stricter, and discharge becomes draws
The leading factor of neck diesel technology progress.Marine diesel controls the basic skills of NOx emission three classes: fuel pretreatment,
Purify and exhaust aftertreatment in cylinder.The target of IMO Tier II can be realized by the technology improving combustion process, and at IMO
In the case of Tier III stage uses diesel fuel, only use EGR Technology (EGR) or SCR
(SCR) technology could meet the DS NOx Est limitation standard in this stage.But volume shared by SCR technology is big, apparatus expensive, and urges
Agent confined condition is many, and EGR technology equipment is simple, is taken up space little, can as the key technology of control NOx emission it
One.
EGR technology can effectively reduce boat diesel engine NOx emission, in certain condition range, the increase of EGR rate and NOx
Minimizing the most linear.The mode realizing waste gas recirculation has a variety of, and low pressure EGR system is to take gas after turbine,
Mix with fresh air before compressor, overcome the problem that high pressure EGR system brings because of intake and exhaust pressure reduction, can be bigger
Realize waste gas recirculation in condition range, but meanwhile, EGR gas can pollute compressor, cause the compressor life-span to contract
Short.High pressure EGR system is currently used more a kind of waste gas egr mode, and during its advantage, EGR gas is not by calming the anger
Machine and charge air cooler, but owing to marine low speed diesel exhaust gas pressure is higher than admission pressure, therefore need to overcome intake and exhaust pressure reduction, ability
Realize waste gas recirculation；The pressure oscillation of air inlet is affected greatly by the membership that adds of EGR gas simultaneously.
Summary of the invention
The purpose of this utility model is to provide the marine low speed of a kind of improvement that can realize preferable EGR rate under full working scope
Diesel engine Venturi tube ERG.
The purpose of this utility model is achieved in that
The marine low speed diesel engine Venturi tube ERG of a kind of improvement of this utility model, is characterized in that: bag
Include diesel engine, turbocharger, Venturi tube, turbocharger include turbine and compressor, described diesel engine connect respectively into
Gas house steward and exhaust main, exhaust main is respectively communicated with turbine inlet pipeline and EGR line, compressor connection blower outlet pipe
Road, EGR line is by the exhaust gas entrance of exhaust inlet pipe connection Venturi tube, entering of blower outlet pipeline connection Venturi tube
Mouthful, inlet manifold connects the outlet of Venturi tube, EGR line is installed cooler for recycled exhaust gas and EGR valve, on blower outlet pipeline
Charge air cooler is installed.
This utility model can also include:
1, described Venturi tube includes being sequentially connected contraction section, mixing section, diffuser, the import of contraction section is venturi
The import of pipe, the outlet that outlet is Venturi tube of diffuser, the exhaust gas entrance of Venturi tube is arranged on mixing section, and waste gas enters
Trachea arranges blender with the junction of mixing section, and described blender is arc, and arc arranges pod apertures.
2, the diameter of contraction section import is more than its diameter with mixing section connecting place, the diameter of diffuser outlet more than its with
The diameter of mixing section connecting place, the diameter of diffuser outlet is more than the diameter of contraction section import, and contraction section and mixing section, mixes
Section and diffuser inner surface between smooth excessively.
3, exhaust inlet pipe and the angle of mixing section are less than 90 °.
Advantage of the present utility model is:
1, this utility model can make high pressure EGR system run at full working scope, due to the impact of intake and exhaust pressure differential, recirculation
There is waste gas and flow backwards in waste gas, it is impossible to enters air inlet pipe, and this utility model patent solves this problem well, uses venturi
Pipe reduces outlet section pressure；
2, this utility model is due to the throttling action of Venturi tube, and during inlet air flow flow through venturi, flow velocity is accelerated, recirculation
Waste gas mixes more uniform with fresh air at mixing section；
3, this utility model is due to the guide functions of blender so that the EGR gas work to the pressure wave that air inlet produces
Pressure stability with minimizing, beneficially gaseous mixture；
4, this utility model is arranged simple, only needs a set of Venturi tube, without complicated pressurizer, especially suitable
In marine low speed diesel engine.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 a is the schematic diagram of this utility model Venturi tube, and Fig. 2 b is blender schematic diagram.
Detailed description of the invention
Illustrate below in conjunction with the accompanying drawings and this utility model be described in more detail:
In conjunction with Fig. 1～2, marine low speed diesel engine Venturi tube ERG includes: marine low speed diesel engine 1,
Exhaust main 2, turbine 3, compressor 4, charge air cooler 5, Venturi tube 6, inlet manifold 7, cooler for recycled exhaust gas 8, EGR valve 9, venturi
Pipe body 6-1, exhaust inlet pipe 6-2, blender 6-3, contraction section L1, mixing section L2, diffuser L3 etc..
As it is shown in figure 1, this utility model includes marine low speed diesel engine 1, cooler for recycled exhaust gas 8, compressor 4, charge air cooler 5 and
Venturi tube 6, the import with turbine 3, cooler for recycled exhaust gas 8 respectively of the exhaust main 2 of diesel engine 1 is connected, the outlet of cooler for recycled exhaust gas 8
Import with Venturi tube 6 is connected, and is provided with EGR valve between the outlet and the exhaust gas inlet of Venturi tube 6 of cooler for recycled exhaust gas 8
9；The import of described compressor 4 is connected with fresh air, and the outlet of compressor 4 is connected with the import of charge air cooler 5, charge air cooler 5
Outlet is connected with the fresh air inlet of Venturi tube 6；Described Venturi tube 6 is used for producing air inlet restriction, forms pressure differential；Institute
The outlet stating Venturi tube 6 is connected with inlet manifold 7, inlet manifold 7 and diesel engine 1 cylinders.
As shown in Figure 2 a, for Venturi tube front view, described Venturi tube 6 includes body 6-1, at the sidewall of body 6-1
On exhaust inlet pipe 6-2 is set；Described body 6-1 includes contraction section L1, mixing section L2 and diffuser L3, contraction section L1 with in cold
The port of export of device 5 is connected, and diffuser L3 is connected with inlet manifold 7；The diameter of described contraction section L1 entrance point is more than contraction section L1
The diameter being connected with mixing section L2, the diameter that the diameter of the diffuser L3 port of export is connected with mixing section L2 more than diffuser L3, expands
The diameter of the pressure section L3 port of export is more than the diameter of contraction section L1 entrance point, and contraction section L1, mixing section L2 are with diffuser L3's
Inner surface smoothly transits, and does not has hard corner angle, and gas flow resistance is little；Described exhaust inlet pipe 6-2 is little with mixing section L2 angle α
In 90 °, to avoid, angle is excessive causes the waste gas impact to fresh air.
As shown in Figure 2 b, for blender 6-3 top view, described Venturi tube mixing section L2 is connected with gas inlet section 6-2
Place is provided with blender 6-3, and described blender is arc, and blender is provided with pod apertures, and blender and table in mixing section L2
Face is smooth to be connected, and does not has hard corner angle, and gas flow resistance is little.
When using this utility model, utilize the throttling action of Venturi tube and the shunting action of blender, air inlet is entered
Row suitably throttling, forms pressure differential, it is ensured that EGR gas can enter mixing section L2, mixes with fresh air, mixing
Gas enters inlet manifold after diffuser L3, finally flows into cylinder.
This utility model, compared with conventional high-tension egr system, does not use EGR blower fan to increase EGR gas
Pressure, but utilize the throttling action of Venturi tube, it is possible to achieve use high pressure EGR system in the range of full working scope, it is ensured that preferably
EGR rate, thus reduce NOx emission.
The marine low speed diesel engine Venturi tube ERG of a kind of improvement of this utility model, including marine low speed
Diesel engine 1, cooler for recycled exhaust gas 8, compressor 4, charge air cooler 5 and Venturi tube 6, the exhaust main 2 of diesel engine 1 respectively with turbine 3,
The import of cooler for recycled exhaust gas 8 is connected, and the outlet of cooler for recycled exhaust gas 8 is connected with the import of Venturi tube 6, in the outlet of cooler for recycled exhaust gas 8
And it is provided with EGR valve 9 between the exhaust gas inlet of Venturi tube 6；The import of described compressor 4 is connected with fresh air, compressor 4
Outlet be connected with the import of charge air cooler 5, the outlet of charge air cooler 5 is connected with the fresh air inlet of Venturi tube 6；Described literary composition mound
In pipe 6 be used for producing air inlet restriction, form pressure differential；The outlet of described Venturi tube 6 is connected with inlet manifold 7, and inlet manifold 7
Cylinders with diesel engine 1.
Venturi tube 6 includes body 6-1, arranges exhaust inlet pipe 6-2 on the sidewall of body 6-1；Described body 6-2 bag
Including contraction section L1, mixing section L2 and diffuser L3, contraction section L1 is connected with charge air cooler 5 outlet, and diffuser L3 is with inlet manifold 7 even
Connect；Described exhaust inlet pipe 6-2 and mixing section L2 angle α are less than 90 °；
The diameter that the diameter of contraction section L1 import is connected with mixing section L2 more than contraction section L1, the diameter of diffuser L3 outlet
The diameter being connected with mixing section L2 more than diffuser L3, the diameter of diffuser L3 outlet is more than the diameter of contraction section L1 import；
Venturi tube mixing section L2 and gas inlet section 6-2 junction are provided with blender 6-3, and described blender is arc
Plate, blender is provided with pod apertures, and blender is smooth with mixing section L2 inner surface is connected.
Claims (3)
1. the marine low speed diesel engine Venturi tube ERG improved, is characterized in that: include diesel engine, turbine
Supercharger, Venturi tube, turbocharger includes turbine and compressor, and described diesel engine connects inlet manifold respectively and aerofluxus is total
Pipe, exhaust main is respectively communicated with turbine inlet pipeline and EGR line, and compressor connection blower outlet pipeline, EGR line passes through
The exhaust gas entrance of exhaust inlet pipe connection Venturi tube, the import of blower outlet pipeline connection Venturi tube, inlet manifold is even
The outlet of logical Venturi tube, EGR line is installed cooler for recycled exhaust gas and EGR valve, and blower outlet pipeline is installed charge air cooler；
Contraction section that described Venturi tube includes being sequentially connected, mixing section, diffuser, the import of contraction section is entering of Venturi tube
Mouthful, the outlet of diffuser is the outlet of Venturi tube, and the exhaust gas entrance of Venturi tube is arranged on mixing section, exhaust inlet pipe with
The junction of mixing section arranges blender, and described blender is arc, and arc arranges pod apertures.
The marine low speed diesel engine Venturi tube ERG of a kind of improvement the most according to claim 1, it is special
Levy and be: the diameter of contraction section import more than it and mixes more than itself and the diameter of mixing section connecting place, the diameter of diffuser outlet
The diameter of section connecting place, the diameter of diffuser outlet more than the diameter of contraction section import, and contraction section and mixing section, mixing section with
Between diffuser inner surface smooth excessively.
The marine low speed diesel engine Venturi tube ERG of a kind of improvement the most according to claim 1 and 2, its
Feature is: exhaust inlet pipe is less than 90 ° with the angle of mixing section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620407269.6U CN205779317U (en) | 2016-05-06 | 2016-05-06 | A kind of marine low speed diesel engine Venturi tube ERG of improvement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620407269.6U CN205779317U (en) | 2016-05-06 | 2016-05-06 | A kind of marine low speed diesel engine Venturi tube ERG of improvement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205779317U true CN205779317U (en) | 2016-12-07 |
Family
ID=57411669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620407269.6U Expired - Fee Related CN205779317U (en) | 2016-05-06 | 2016-05-06 | A kind of marine low speed diesel engine Venturi tube ERG of improvement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205779317U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822463A (en) * | 2016-05-06 | 2016-08-03 | 哈尔滨工程大学 | Venturi pipe waste gas recirculating device of improved ship low-speed diesel engine |
| CN108014667A (en) * | 2017-12-12 | 2018-05-11 | 中国科学院过程工程研究所 | A kind of flue gas mixing arrangement and method |
-
2016
- 2016-05-06 CN CN201620407269.6U patent/CN205779317U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822463A (en) * | 2016-05-06 | 2016-08-03 | 哈尔滨工程大学 | Venturi pipe waste gas recirculating device of improved ship low-speed diesel engine |
| CN108014667A (en) * | 2017-12-12 | 2018-05-11 | 中国科学院过程工程研究所 | A kind of flue gas mixing arrangement and method |
| WO2019114138A1 (en) * | 2017-12-12 | 2019-06-20 | 中国科学院过程工程研究所 | Flue gas mixing device and method |
| CN108014667B (en) * | 2017-12-12 | 2019-08-13 | 中国科学院过程工程研究所 | A kind of flue gas mixing arrangement and method |
| JP2020528343A (en) * | 2017-12-12 | 2020-09-24 | 中国科学院過程工程研究所Ｉｎｓｔｉｔｕｔｅ Ｏｆ Ｐｒｏｃｅｓｓ Ｅｎｇｉｎｅｅｒｉｎｇ，Ｃｈｉｎｅｓｅ Ａｃａｄｅｍｙ Ｏｆ Ｓｃｉｅｎｃｅｓ | Flue gas mixer and method |
| JP7078708B2 (en) | 2017-12-12 | 2022-05-31 | 中国科学院過程工程研究所 | Flue gas mixer and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161207 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |